JPS596448A - Hydraulic buffer - Google Patents
Hydraulic bufferInfo
- Publication number
- JPS596448A JPS596448A JP11519782A JP11519782A JPS596448A JP S596448 A JPS596448 A JP S596448A JP 11519782 A JP11519782 A JP 11519782A JP 11519782 A JP11519782 A JP 11519782A JP S596448 A JPS596448 A JP S596448A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- rod
- rod pipe
- damper case
- pipe
- 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.)
- Granted
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
-
- 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
-
- 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
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
- F16F9/486—Arrangements for providing different damping effects at different parts of the stroke comprising a pin or stem co-operating with an aperture, e.g. a cylinder-mounted stem co-operating with a hollow piston rod
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、ピストンの伸縮動作に伴って、その流速に抵
抗を与えて減衰力を発生させる油圧緩衝器において、ピ
ストンの伸縮位置によって減衰力の大きさを可変とした
油圧緩衝器に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a hydraulic shock absorber that generates damping force by resisting the flow velocity as the piston expands and contracts, and the magnitude of the damping force is made variable depending on the piston's expansion and contraction position. This relates to hydraulic shock absorbers.
従来、この種の油圧緩衝器においては、中空のピストン
ロッド先端のピストンを、ダンパーケース内に摺動自在
に嵌装し、ピストンに設けた油路と弁機構により圧縮行
程及び伸長行程時に１それぞれ減衰力を得るようにした
油圧緩衝器で、ダンパーケース内に突出せしめたロッド
パイプを前記ピストンロッドの中空部に挿入し、またピ
ストンの一部に設けた縮径段部のオイルシール又け０リ
ング等を介して前記ロッドパイプと摺動せしめるように
し、ピストンロッドに設けた油孔とロッドパイプに設け
た軸方向の１個乃至複数個のオリフィスを介しダンパー
ケースの下部油室から上部油室に連通ずる油路を形成し
、ピストンの伸縮位置によってオリフィスに流れる油の
量を変化せしめて減衰力を可変できるようにしたものが
ある。Conventionally, in this type of hydraulic shock absorber, a piston at the tip of a hollow piston rod is slidably fitted into a damper case, and an oil passage and a valve mechanism provided in the piston allow the piston to move during the compression stroke and extension stroke, respectively. In a hydraulic shock absorber designed to obtain damping force, a rod pipe protruding into the damper case is inserted into the hollow part of the piston rod, and an oil seal straddles the diameter-reducing step provided in a part of the piston. It is made to slide on the rod pipe through a ring or the like, and is connected to the upper oil chamber from the lower oil chamber of the damper case through an oil hole provided in the piston rod and one or more orifices in the axial direction provided in the rod pipe. There is one in which an oil passage is formed that communicates with the orifice, and the amount of oil flowing to the orifice is varied depending on the extension/retraction position of the piston, thereby making it possible to vary the damping force.
（第３ 頁）
しかしながら、この種の可変機構でピストンロッドとロ
ッドパイプ間をオイルシール又はＯリング等を使用して
シールする場合、ロッドパイプにオリフィスが存在する
とピストンロッドの摺動によってシール部分にかじりが
生じて部品の寿命を著しく短縮せしめる。また、シール
性を完全にすると摺動抵抗が大きくなる等の問題点があ
った。(Page 3) However, when using this type of variable mechanism to seal between the piston rod and rod pipe using an oil seal or an O-ring, if an orifice exists in the rod pipe, the sliding of the piston rod may damage the seal part. Galling occurs, significantly shortening the life of the parts. Furthermore, if the sealing properties were perfected, there were problems such as increased sliding resistance.
本発明は、このような問題点を解決するもので、ダンパ
ーケース内に油と磁性体を混合した磁性流体を封入し、
ピストンとロンドパイブ間のシールに、この磁性流体を
使用してシール性を高めると共に摺動抵抗を感じ、かつ
部品の寿命を大幅に延長せしめるようにしたものである
、以下本発明の一実施例を図面により詳細に説明する。The present invention solves these problems by enclosing a magnetic fluid, which is a mixture of oil and magnetic material, in a damper case.
An embodiment of the present invention is described below, in which this magnetic fluid is used in the seal between the piston and the rond pipe to improve sealing performance, feel sliding resistance, and significantly extend the life of the parts. This will be explained in detail with reference to the drawings.
第１図は本発明油圧緩衝器の一実施例を示す断面図であ
る７図において、１は中空のピストンロッド２の先端に
嵌装したピストン３を、内部に油と磁性体を混合した磁
性流体を封入したダンパーケース４内に摺動自在に嵌合
し、ピストンロッド２の植設基部５とダンパーケース４
間にコイルば（ｉｌｉ ４ ＊）Ｔ、開口Ｕ ５９
−６４４８ （２’）ね６を張架してなる油圧緩衝器
で、ピストン３に設けた油孔７，８及び弁機構９．１０
により圧縮行程又は伸長行程に減衰力を得るようにしで
ある。Fig. 1 is a cross-sectional view showing one embodiment of the hydraulic shock absorber of the present invention. The piston rod 2 is slidably fitted into the damper case 4 filled with fluid, and the piston rod 2 is connected to the implanted base 5 of the damper case 4.
Between the coils (ili 4 *) T, opening U 59
-6448 (2') Hydraulic shock absorber made by tensioning the screw 6, with oil holes 7, 8 provided in the piston 3 and valve mechanism 9.10
This is to obtain a damping force during the compression stroke or extension stroke.
一方、ダンパーケース４内の上部中央より突出せしめた
ロンドパイブ１１を前記ピストンロッド２の中空部２ａ
内に挿入し、ピストン３の一部に縮径段部３ａを設けて
ロッドパイプ１１と縮径段部３ａの間に適当な隙間１２
を通じてダンノミ−ケース４、ピストン３、ロッドパイ
プ１１間に磁気回路を形成せしめる。次に、この磁気回
路の一部、例えばロンドパイブ１１の根元に電磁コイル
１３を設け、電流を流しておくとその隙間１２に磁界が
生じ、その間に存在する磁性流体の粘度が高くなり隙間
１２をシールする。なお、参考のため従来は摺動部材（
シール材）を縮径段部３ａに取付けてシールしている。On the other hand, a round pipe 11 protruding from the center of the upper part of the damper case 4 is connected to the hollow part 2a of the piston rod 2.
A diameter-reducing step 3a is provided in a part of the piston 3 to create an appropriate gap 12 between the rod pipe 11 and the diameter-reducing step 3a.
A magnetic circuit is formed between the hammer case 4, the piston 3, and the rod pipe 11. Next, an electromagnetic coil 13 is provided at a part of this magnetic circuit, for example, at the root of the rond pipe 11, and when a current is passed through the gap 12, a magnetic field is generated, and the viscosity of the magnetic fluid existing therein increases, causing the gap 12 to close. Seal. For reference, the sliding member (
A sealing material) is attached to the diameter-reduced step portion 3a for sealing.
一方、前記ロッドパイプｌ】には軸方向にオリフィス１
１ ａを１個乃至複数個（図では８個）設け、ピストン
ロッド２に設けた油孔１４を介してダンパーケース４の
下部油室Ａと上部油室Ｂとを連通せしめたものである。On the other hand, the rod pipe L] has an orifice 1 in the axial direction.
1a are provided, and the lower oil chamber A and the upper oil chamber B of the damper case 4 are communicated through an oil hole 14 provided in the piston rod 2.
なお、１５は別置のタンクで、ダイアフラム１．５ ａ
を介して油室Ｃと気体室りとに区画され、油室Ｃけダン
・ξ−ケース４の上部油室Ｂと可撓性パイプ１６で連絡
せしめて、油がピストンロッド２の伸縮によって生ずる
ダン・ξ−ケース４内の体積の変化分に対し、油の吸収
及び排出を行なわしめる。In addition, 15 is a separate tank, and the diaphragm 1.5a
The oil chamber C is divided into an oil chamber C and a gas chamber via a flexible pipe 16, and the oil chamber C is connected to the upper oil chamber B of the case 4 through a flexible pipe 16, so that oil is generated by the expansion and contraction of the piston rod 2. Dan・ξ--Oil is absorbed and discharged in response to a change in volume within the case 4.
次に、その動作を陵、明する。Next, I will explain its operation.
予め電磁コイル１３に通電しておく。そして緩衝器が伸
び切った状態から圧縮行程に入ると、弁機構１０はダン
パーケース４の上部油室Ｂの内圧により座着し、そのた
め油室Ｂの磁性流体は、一方では油孔７より弁機構９を
押し開いて下部油室Ａに流れ緩衝作用が行なわれる。ま
た他方では上部油室Ｂの位置にあるロンドパイブ１】の
オリフィスＩＪａ（この場合８個全部）を通ってピスト
ンロッド２の中空部２ａを経て油孔１４より下部油室Ａ
にも流れる。そのため減衰力が発生するが、ロッドパイ
プ１］の位置が下方へ下がる程、オリフィス１１ ａの
数が減るので減衰力は段々大きくなる。The electromagnetic coil 13 is energized in advance. Then, when the shock absorber enters the compression stroke from the fully extended state, the valve mechanism 10 is seated due to the internal pressure of the upper oil chamber B of the damper case 4, and therefore the magnetic fluid in the oil chamber B flows from the oil hole 7 to the valve mechanism 10. The mechanism 9 is pushed open to flow into the lower oil chamber A and provide a buffering effect. On the other hand, it passes through the orifice IJa (all eight in this case) of the round pipe 1 located in the upper oil chamber B, through the hollow part 2a of the piston rod 2, and then from the oil hole 14 to the lower oil chamber A.
It also flows. Therefore, a damping force is generated, and as the position of the rod pipe 1 moves downward, the number of orifices 11a decreases, so the damping force gradually increases.
反対に、圧縮状態から伸長行程時に入ると、反対に弁機
構９けダンパーケース４の下部油室Ａの内圧により座着
し、油室Ａの磁性流体は油孔、８より弁機構１０を押し
開いて上部油室Ｂに流れて緩衝作用が行なわれるほか、
油孔１４−中空部２ａ−ロッドパイプｌ】−オリフィス
１１ ａ−上部油室ＢＫ流れて減衰力は次第に小さくな
る。なお、電磁コイル１３の代りに永久磁石を用いても
同じである。On the other hand, when entering the extension stroke from the compression state, the valve mechanism 9 is seated due to the internal pressure in the lower oil chamber A of the damper case 4, and the magnetic fluid in the oil chamber A pushes the valve mechanism 10 through the oil hole 8. In addition to opening and flowing into the upper oil chamber B to provide a buffering effect,
Oil hole 14 - Hollow part 2a - Rod pipe l] - Orifice 11 a - Upper oil chamber BK flows and the damping force gradually decreases. Note that the same effect can be obtained even if a permanent magnet is used instead of the electromagnetic coil 13.
このようにピストン３とロッドバイア”１１間のシール
、即ち隙間１２のシールには隙間】２に発生させた磁界
圧よってその間の磁性流体の粘性を高めてシールを行う
ようにしているので、従来のように直接シール部材によ
る摺動部品を使用するのとけ異なり摺動抵抗が小さく、
またオリフィス１１ ａによって摺動部品がかじられる
ことがない。また磁界の強さＫよってシール性が自由に
調節できる。In this way, the seal between the piston 3 and the rod via ``11'', that is, the seal in the gap 12, uses the magnetic field pressure generated in the gap ``2'' to increase the viscosity of the magnetic fluid between them to achieve sealing. Unlike using sliding parts with direct seal members, the sliding resistance is small,
Furthermore, the sliding parts are not scratched by the orifice 11a. Furthermore, the sealing performance can be freely adjusted by adjusting the strength K of the magnetic field.
以上詳細に説明したように、本発明は極めて簡単な構成
で、シール部品の寿命を大幅に延長できる効果がある。As described above in detail, the present invention has an extremely simple configuration and has the effect of significantly extending the life of seal components.
なお、本発明はフロントフォークにも使用できる。Note that the present invention can also be used for front forks.
（第 ７頁）(Page 7)
図は本発明油圧緩衝器の一実施例を示す断面図である。
１・・・油圧緩衝器、２・・・ピストンロッド、２ａ・
・・中空部、３・・・ピストン、３ａ・・・縮径段部、
４・・・ダンパーケース、６・・・コイルばね、７，８
・・・油孔、９．ＩＯ・・・弁機構、１１・・・ロッド
パイプ、１１ ａ・・・オリフィス、１２・・・隙間、
１３・・・電磁コイル、１４・・・油孔、１５・・・タ
ンク、Ａ、Ｂ、Ｃ・・・油室、Ｄ・・・気体室。
特許出願人 株式会社 昭 和 製 作 所持開口５
ｓａ−６４４ａ （３）
＼The figure is a sectional view showing an embodiment of the hydraulic shock absorber of the present invention. 1... Hydraulic shock absorber, 2... Piston rod, 2a.
...Hollow part, 3...Piston, 3a...Reduced diameter step part,
4... Damper case, 6... Coil spring, 7, 8
...Oil hole, 9. IO... Valve mechanism, 11... Rod pipe, 11 a... Orifice, 12... Gap,
13... Electromagnetic coil, 14... Oil hole, 15... Tank, A, B, C... Oil chamber, D... Gas chamber. Patent applicant: Showa Co., Ltd. Manufactured by possession opening 5
sa-644a (3) \
Claims (2)
減衰力を発生する弁機構を備えたピストンを、磁性流体
を封入したダンパーケース内に摺動自在に嵌装し、一方
、ダンパーケース内に突出せしめ九ロッドパイプを前記
ピストンロッドの中空部に挿入し、かつピストンの一部
に縮径段部を設けてロッドパイプと縮径段部間に適当な
隙間を設けると共にダンノミ−ケース、ピストン、ロッ
ドパイプ間に磁気回路を形成し、かつ、その一部に電磁
コイルを設けて前記隙間に生ずる磁性流体の粘度によシ
その隙間をシールすると共にロッドパイプには１個乃至
複数個のオリフィスを介して位置依存による可変機構を
設けたことを特徴とする油圧緩衝器。(1) A piston equipped with a valve mechanism that generates damping force during expansion and compression at the tip of a hollow piston rod is slidably fitted into a damper case filled with magnetic fluid. A protruding nine-rod pipe is inserted into the hollow part of the piston rod, and a diameter-reducing step is provided in a part of the piston to provide an appropriate gap between the rod pipe and the diameter-reducing step. A magnetic circuit is formed between the rod pipes, an electromagnetic coil is provided in a part of the magnetic circuit, and the gap is sealed by the viscosity of the magnetic fluid generated in the gap, and one or more orifices are provided in the rod pipe. A hydraulic shock absorber characterized in that a position-dependent variable mechanism is provided through the hydraulic shock absorber.
許請求の範囲第１項記載の油圧緩衝器。(2) The hydraulic shock absorber according to claim 1, wherein the electromagnetic coil is a permanent magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11519782A JPS596448A (en) | 1982-07-02 | 1982-07-02 | Hydraulic buffer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11519782A JPS596448A (en) | 1982-07-02 | 1982-07-02 | Hydraulic buffer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS596448A true JPS596448A (en) | 1984-01-13 |
| JPH023065B2 JPH023065B2 (en) | 1990-01-22 |
Family
ID=14656756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11519782A Granted JPS596448A (en) | 1982-07-02 | 1982-07-02 | Hydraulic buffer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS596448A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6029958A (en) * | 1996-06-25 | 2000-02-29 | Ohlins Racing Ab | Shock absorber |
| EP1880936A3 (en) * | 2006-07-20 | 2009-01-14 | GUSTAV MAGENWIRTH GmbH & Co. KG | Damper |
| JP2012193755A (en) * | 2011-03-15 | 2012-10-11 | Kurimoto Ltd | Seal structure for rod |
| US20160298714A1 (en) * | 2015-04-10 | 2016-10-13 | Messier-Dowty Limited | Hydraulic shock absorber |
| CN110469621A (en) * | 2018-05-10 | 2019-11-19 | 本田技研工业株式会社 | Magneto-rheological fluid type damping device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0614453U (en) * | 1992-07-28 | 1994-02-25 | 川崎重工業株式会社 | Engine decompressor |
-
1982
- 1982-07-02 JP JP11519782A patent/JPS596448A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6029958A (en) * | 1996-06-25 | 2000-02-29 | Ohlins Racing Ab | Shock absorber |
| EP1880936A3 (en) * | 2006-07-20 | 2009-01-14 | GUSTAV MAGENWIRTH GmbH & Co. KG | Damper |
| JP2012193755A (en) * | 2011-03-15 | 2012-10-11 | Kurimoto Ltd | Seal structure for rod |
| US20160298714A1 (en) * | 2015-04-10 | 2016-10-13 | Messier-Dowty Limited | Hydraulic shock absorber |
| US10024379B2 (en) * | 2015-04-10 | 2018-07-17 | Safran Landing Systems Uk Ltd | Hydraulic shock absorber |
| CN110469621A (en) * | 2018-05-10 | 2019-11-19 | 本田技研工业株式会社 | Magneto-rheological fluid type damping device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH023065B2 (en) | 1990-01-22 |
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