JPH06147248A - Hydraulic buffer - Google Patents
Hydraulic bufferInfo
- Publication number
- JPH06147248A JPH06147248A JP5020560A JP2056093A JPH06147248A JP H06147248 A JPH06147248 A JP H06147248A JP 5020560 A JP5020560 A JP 5020560A JP 2056093 A JP2056093 A JP 2056093A JP H06147248 A JPH06147248 A JP H06147248A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- oil
- peripheral surface
- case
- hollow shaft
- 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
Landscapes
- Fluid-Damping Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はオイルシールを組み込ん
だ油圧緩衝器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic shock absorber incorporating an oil seal.
【０００２】[0002]
【従来の技術】油圧緩衝器にあっては特開昭６０−３７
４３３号に開示されるように、内部に作動油を密封した
シリンダの一端部に配設したオイルシールを介して摺動
するピストンロッドが、シリンダ外部の作動油に浸漬す
る構造の油圧緩衝器が開示されている。そして、オイル
シールはシリンダ内の作動油がシリンダ外に洩れるのを
防止する形状になっているので、緩衝器が伸縮動を繰り
返しているうちにシリンダ外の作動油が徐々にシリンダ
内に入り込み、シリンダ内の圧力が高くなって緩衝性能
の悪化やシリンダ各部の破損を来たす。そこで、特開昭
６０−３７４３３号にあっては、シリンダの端部にフリ
ーピストンを設けて気体室を画成し、この気体室でシリ
ンダ内の体積変化を吸収するとともにフリーピストンが
所定位置まで移動したならば、シリンダ外に連通する逃
し通路を開成して余分な作動油をシリンダ外に戻す圧力
吸収機構を設けている。2. Description of the Related Art A hydraulic shock absorber is disclosed in JP-A-60-37.
As disclosed in Japanese Patent No. 433, a hydraulic shock absorber having a structure in which a piston rod sliding through an oil seal disposed at one end of a cylinder in which hydraulic oil is sealed is immersed in hydraulic oil outside the cylinder is disclosed. It is disclosed. Since the oil seal has a shape that prevents the hydraulic oil inside the cylinder from leaking out of the cylinder, the hydraulic oil outside the cylinder gradually enters the cylinder while the shock absorber repeatedly extends and contracts. The pressure in the cylinder becomes high, resulting in deterioration of cushioning performance and damage to various parts of the cylinder. Therefore, in Japanese Patent Laid-Open No. 60-37433, a free piston is provided at the end of the cylinder to define a gas chamber, and this gas chamber absorbs a volume change in the cylinder and the free piston reaches a predetermined position. A pressure absorbing mechanism is provided for returning excess hydraulic oil to the outside of the cylinder by opening a relief passage that communicates with the outside of the cylinder when it moves.
【０００３】[0003]
【発明が解決しようとする課題】上述した油圧緩衝器に
よれば、気体室の圧力上昇によるシリンダ各部の破損を
防止することができるが、フリーピストンを設けた側に
減衰力機構を設けることができなくなってしまう。According to the hydraulic shock absorber described above, it is possible to prevent damage to each part of the cylinder due to an increase in pressure in the gas chamber, but it is possible to provide a damping force mechanism on the side where the free piston is provided. I can not do it.
【０００４】[0004]
【課題を解決するための手段】上記問題点を解決すべく
本発明は、作動油を封入したシリンダ内にピストンロッ
ドを挿入し、シリンダ内の一端部にオイルシールを取り
付け、シリンダの他端部に圧力吸収機構を設け、この圧
力吸収機構はスプリングにて付勢されるとともに摺動自
在な隔壁部材にて前記シリンダ内の油室及びシリンダ外
の油室とつながる気体室とを画成し、また隔壁部材を貫
通してシャフトを前記シリンダ内に臨ませ、このシャフ
トの先端側に圧側減衰力機構を配設し、更にシャフト外
周面に隔壁部材が所定位置まで移動した際に隔壁部材に
て画成される油室と気体室とを連通せしめる通路を形成
した。In order to solve the above-mentioned problems, the present invention is to insert a piston rod into a cylinder in which hydraulic oil is sealed, attach an oil seal to one end of the cylinder, and attach the other end of the cylinder. A pressure absorbing mechanism is provided on the pressure absorbing mechanism, and the pressure absorbing mechanism defines a gas chamber connected to the oil chamber inside the cylinder and the oil chamber outside the cylinder by a partition wall member that is slidable and is slidable. Further, the shaft is exposed through the partition member to the inside of the cylinder, a compression side damping force mechanism is provided on the tip side of the shaft, and the partition member is used when the partition member moves to a predetermined position on the outer peripheral surface of the shaft. A passage was formed to connect the defined oil chamber and gas chamber.
【０００５】[0005]
【作用】緩衝器が伸縮動を繰り返すとシリンダ外の作動
油がシリンダ内に持ち込まれ、これにより隔壁部材の摺
動位置が徐々に上昇する。そして隔壁部材が中空シャフ
トの縮径部まで上昇すると、縮径部を介して作動油が気
体室に流入し、更に気体室に流入した作動油はケースに
形成した油孔を介してシリンダ外の油室に戻る。When the shock absorber repeatedly expands and contracts, hydraulic oil outside the cylinder is brought into the cylinder, whereby the sliding position of the partition member gradually rises. Then, when the partition member rises to the reduced diameter portion of the hollow shaft, the working oil flows into the gas chamber through the reduced diameter portion, and the working oil that further flows into the gas chamber is discharged outside the cylinder through the oil hole formed in the case. Return to the oil chamber.
【０００６】[0006]
【実施例】以下に本発明の実施例を添付図面に基づいて
説明する。ここで、図１は本発明に係る油圧緩衝器の要
部断面図、図２は図１の要部拡大断面図、図３は図１の
懸架スプリング係止構造に係る部分の拡大断面図、図４
は図３の分解斜視図である。Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a sectional view of an essential part of a hydraulic shock absorber according to the present invention, FIG. 2 is an enlarged sectional view of an essential part of FIG. 1, and FIG. 3 is an enlarged sectional view of a part related to a suspension spring locking structure of FIG. Figure 4
FIG. 4 is an exploded perspective view of FIG. 3.
【０００７】油圧緩衝器は、アウターチューブ１内に下
方からインナーチューブ２を摺動自在に挿通し、このア
ウターチューブ１の下端部内周面にはインナーチューブ
２外周面に摺接するブッシュ３を嵌着し、インナーチュ
ーブ２の上端部外周面にはアウターチューブ１内周面に
摺接するブッシュ４を嵌着している。In the hydraulic shock absorber, the inner tube 2 is slidably inserted into the outer tube 1 from below, and a bush 3 which is slidably contacted with the outer peripheral surface of the inner tube 2 is fitted to the inner peripheral surface of the lower end portion of the outer tube 1. A bush 4 that is in sliding contact with the inner peripheral surface of the outer tube 1 is fitted on the outer peripheral surface of the upper end portion of the inner tube 2.
【０００８】アウターチューブ１の上端部にはケース５
を螺着し、このケース５の下端部にはインナーチューブ
２内に臨むシリンダ６の上端部を螺着している。インナ
ーチューブ２の下端部外周には車軸取付用のブラケット
７を装着し、またインナーチューブ２の下端部内周には
オイルロックピース８を嵌装して、このオイルロックピ
ース８はボトムボルト９にてブラケット７に固定し、更
にボトムボルト９には中空ロッド１０の下端部を螺着し
て固定し、この中空ロッド１０の先端部をシリンダ６内
に臨ませている。A case 5 is provided at the upper end of the outer tube 1.
The upper end of the cylinder 6 facing the inner tube 2 is screwed to the lower end of the case 5. An axle mounting bracket 7 is attached to the outer periphery of the lower end of the inner tube 2, and an oil lock piece 8 is fitted to the inner periphery of the lower end of the inner tube 2. The oil lock piece 8 is attached by a bottom bolt 9. The hollow rod 10 is fixed to the bracket 7, and further, the lower end of the hollow rod 10 is screwed and fixed to the bottom bolt 9, and the tip of the hollow rod 10 is exposed to the inside of the cylinder 6.
【０００９】そして、この中空ロッド１０の先端部には
中空のピストン支持部材１１を装着し、このピストン支
持部材１１にはシリンダ６内周面に摺接するピストン１
２を装着し、このピストン１２には圧縮側油路１３及び
伸び側油路１４を形成して、これらの圧縮側油路１３及
び伸び側油路１４を開閉する圧縮側バルブ１５及び伸び
側バルブ１６を装着している。また、中空ロッド１０内
にはニードル１７を進退自在に挿通し、このニードル１
７の下端部はアジャスタピース１８に取付けている。A hollow piston support member 11 is attached to the tip of the hollow rod 10, and the piston 1 slidably contacts the inner peripheral surface of the cylinder 6 on the piston support member 11.
2, a compression side oil passage 13 and an extension side oil passage 14 are formed in the piston 12, and a compression side valve 15 and an extension side valve for opening and closing the compression side oil passage 13 and the extension side oil passage 14, respectively. I am wearing 16. In addition, a needle 17 is inserted into the hollow rod 10 so that the needle 17 can move back and forth.
The lower end of 7 is attached to the adjuster piece 18.
【００１０】また、シリンダ６の下端部内周にはロッド
ガイド２１を螺合し、更にシリンダ６の下端部にはオイ
ルロックカラー２０を遊嵌し、このロッドガイド２１内
周面には中空ロッド１０外周面に摺接するブッシュ２２
を嵌着し、ロッドガイド２１の上方には中空ロッド１０
外周面に摺接するオイルシール２３を嵌装している。こ
のオイルシール２３は緩衝器がストロークするたびに中
空ロッド１０外周面に付着した作動油をシリンダ内の油
室Ｓ２内に徐々に取り込む。A rod guide 21 is screwed onto the inner periphery of the lower end of the cylinder 6, and an oil lock collar 20 is loosely fitted on the lower end of the cylinder 6, and the hollow rod 10 is attached to the inner peripheral surface of the rod guide 21. Bushing 22 sliding on the outer peripheral surface
The hollow rod 10 above the rod guide 21.
An oil seal 23, which is in sliding contact with the outer peripheral surface, is fitted. The oil seal 23 gradually takes in the working oil attached to the outer peripheral surface of the hollow rod 10 into the oil chamber S2 in the cylinder each time the shock absorber strokes.
【００１１】更に、アウターチューブ１の上端部には減
衰力調整機構と圧力吸収機構を設けている。即ちアウタ
ーチューブ１の上端部に螺着したケース５の上端部には
フォークボルト２５を螺着し、このフォークボルト２５
には中空シャフト２６の上端部を固定してケース５内に
垂下せしめている。この中空シャフト２６の下端部には
中空のピストン支持部材２７を嵌着し、このピストン支
持部材２７の下端部にはシリンダ６内周面にｏリングを
介して接するピストン２８を嵌着し、このピストン２８
には圧縮側油路３０及び伸び側油路３１を形成して、こ
れらの圧縮側油路３０及び伸び側油路３１を開閉する圧
縮側バルブ３２及び伸び側バルブ３３を嵌着している。
又、中空シャフト２６の内部には外部操作可能なニード
ル３４を進退自在に螺着している。Further, a damping force adjusting mechanism and a pressure absorbing mechanism are provided at the upper end of the outer tube 1. That is, a fork bolt 25 is screwed to the upper end of the case 5 screwed to the upper end of the outer tube 1, and the fork bolt 25
The upper end of the hollow shaft 26 is fixed and is hung in the case 5. A hollow piston support member 27 is fitted to the lower end of the hollow shaft 26, and a piston 28 which is in contact with the inner peripheral surface of the cylinder 6 via an o-ring is fitted to the lower end of the piston support member 27. Piston 28
A compression-side oil passage 30 and an extension-side oil passage 31 are formed therein, and a compression-side valve 32 and an extension-side valve 33 that open and close the compression-side oil passage 30 and the extension-side oil passage 31 are fitted therein.
Further, a needle 34 that can be operated externally is screwed inside the hollow shaft 26 so as to be able to move forward and backward.
【００１２】そして、ケース５の外周面には溝３６を形
成し、この溝３６とケース５内の気体室とを連通する油
孔３７を形成し、またケース５内にはケース５内周面及
び中空シャフト２６の外周面に摺接する隔壁部材として
のダイヤフラム３８を嵌装し、このダイヤフラム３８と
フォークボルト２５との間にはスプリング３９を介設
し、シリンダ６内の作動油を加圧している。更に中空シ
ャフト２６の中間部は外周面を小径に形成した縮径部２
６ａとしている。A groove 36 is formed on the outer peripheral surface of the case 5, an oil hole 37 is formed to connect the groove 36 and a gas chamber in the case 5, and the inner peripheral surface of the case 5 is formed in the case 5. Also, a diaphragm 38 as a partition member that is in sliding contact with the outer peripheral surface of the hollow shaft 26 is fitted, and a spring 39 is provided between the diaphragm 38 and the fork bolt 25 to pressurize the hydraulic oil in the cylinder 6. There is. Further, the intermediate portion of the hollow shaft 26 has a reduced diameter portion 2 whose outer peripheral surface is formed to have a small diameter.
6a.
【００１３】更に、図３及び図４に示すようにシリンダ
６の外周面には環状溝４０を形成し、この環状溝４０内
に２分割したコッター４１，４１を嵌合し、このコッタ
ー４１，４１の外周面にはシリンダ６の下方から嵌入し
たカバー４２を装着することにより、コッター４１，４
１をシリンダ６に固定し、更にコッター４１，４１の上
側にはシリンダ６外周面とカバー４２内周面との間に溝
付部材４３を嵌装して（図３右半分図示の状態）、カバ
ー４２の上端部をこれらの溝付部材４３の外周面に形成
した溝４４に加締めて（図３左半分図示の状態）、これ
らのコッター４１、カバー４２及び溝付部材４３をシリ
ンダ６の外周面に固定している。そして、カバー４２の
下端面にてオイルロックカラー８上端部外周面に装着し
たスプリング受け４５との間に介設した懸架スプリング
４６の上端を係止し、また溝付部材４３上にはリターン
スプリング４７を載設している。Further, as shown in FIGS. 3 and 4, an annular groove 40 is formed on the outer peripheral surface of the cylinder 6, and cotters 41, 41 divided into two are fitted in the annular groove 40. By mounting a cover 42 fitted from below the cylinder 6 on the outer peripheral surface of the cotters 41, 4
1 is fixed to the cylinder 6, and a grooved member 43 is fitted between the outer peripheral surface of the cylinder 6 and the inner peripheral surface of the cover 42 above the cotters 41, 41 (state shown in the right half of FIG. 3). The upper end of the cover 42 is caulked to the groove 44 formed on the outer peripheral surface of the grooved member 43 (the state shown in the left half of FIG. 3), and the cotter 41, the cover 42 and the grooved member 43 are attached to the cylinder 6. It is fixed to the outer peripheral surface. Then, the lower end surface of the cover 42 locks the upper end of a suspension spring 46 interposed between a spring receiver 45 mounted on the outer peripheral surface of the upper end portion of the oil lock collar 8, and the return spring on the grooved member 43. 47 are installed.
【００１４】上記の如く構成した油圧緩衝器において
は、伸縮動によって油室Ｓ１の作動油が中空ロッド１０
の外周面に付着して、この中空ロッド１０の外周面に付
着した作動油がシリンダ６のオイルシール２３に方向性
があるために、オイルシール２３を介してシリンダ内油
室Ｓ２内に微量ずつ流入して、長期的に油室Ｓ２内の作
動油の量が増加する。In the hydraulic shock absorber constructed as described above, the working oil in the oil chamber S1 is expanded and contracted to cause the hollow rod 10 to move.
Since the hydraulic oil that adheres to the outer peripheral surface of the hollow rod 10 has a directivity in the oil seal 23 of the cylinder 6, a small amount of oil is introduced into the cylinder internal oil chamber S2 through the oil seal 23. Inflow, the amount of hydraulic oil in the oil chamber S2 increases for a long term.
【００１５】このように油室Ｓ２内に作動油が蓄積され
て内圧が増加するとシール部を介してフリクションが増
大することになるが、この油圧緩衝器にあっては、油室
Ｓ２内に流入した作動油はピストン２８を介してケース
５のダイヤフラム３８の下側空間Ｓ３内に流入してダイ
ヤフラム３８のストローク中心を徐々に押上げる。そし
て、ダイヤフラム３８が中空シャフト２６の縮径部２６
ａの位置まで押上げられると、空間Ｓ３内の作動油は、
ダイヤフラム３８の内径シール部と中空シャフト２６の
縮径部２６ａとの間を通り、ケース５の油孔３７及び溝
３６を介して再度シリンダ外油室Ｓ２へ還流するので、
フリクションの大きな変化や各部の破損が防止される。When the hydraulic oil is accumulated in the oil chamber S2 and the internal pressure is increased as described above, the friction is increased through the seal portion. However, in this hydraulic shock absorber, it flows into the oil chamber S2. The hydraulic oil thus made flows into the lower space S3 of the diaphragm 38 of the case 5 via the piston 28 and gradually pushes up the stroke center of the diaphragm 38. Then, the diaphragm 38 is used as the reduced diameter portion 26 of the hollow shaft 26.
When pushed up to the position a, the hydraulic oil in the space S3 becomes
Since it passes between the inner diameter seal portion of the diaphragm 38 and the reduced diameter portion 26a of the hollow shaft 26 and returns to the outer cylinder oil chamber S2 again through the oil hole 37 and the groove 36 of the case 5,
A large change in friction and damage to each part are prevented.
【００１６】[0016]
【発明の効果】以上に説明したように本発明によれば、
シリンダ内の作動油の容積に応じて摺動する隔壁部材を
貫通してシャフトをシリンダ内に臨ませ、このシャフト
の先端部に減衰力機構を配設するとともにシャフトの外
周部に作動油の逃し通路を形成したので、圧力吸収機構
と減衰力機構とを同一箇所に無理なく配置するとことが
でき、一定の緩衝特性を維持することができる。As described above, according to the present invention,
The shaft penetrates through the partition member that slides according to the volume of the hydraulic oil in the cylinder, and the shaft is exposed to the cylinder. A damping force mechanism is installed at the tip of this shaft and the hydraulic oil escapes to the outer periphery of the shaft. Since the passage is formed, the pressure absorbing mechanism and the damping force mechanism can be arranged in the same place without difficulty, and a constant cushioning characteristic can be maintained.
【図１】本発明に係る油圧緩衝器の要部断面図FIG. 1 is a sectional view of essential parts of a hydraulic shock absorber according to the present invention.
【図２】図１の要部拡大断面図FIG. 2 is an enlarged cross-sectional view of the main part of FIG.
【図３】図１の懸架スプリング係止構造に係る部分の拡
大断面図FIG. 3 is an enlarged sectional view of a portion related to the suspension spring locking structure of FIG.
【図４】図３の分解斜視図FIG. 4 is an exploded perspective view of FIG.
１…アウターチューブ、２…インナーチューブ、５…ケ
ース、６…シリンダ、１０…中空ロッド、１２…ピスト
ン、２６…中空シャフト、３８…ダイヤフラム、４０…
シリンダの溝、４１…コッター、４２…カバー、４３…
溝付部材、４４…溝付部材の溝、４６…懸架スプリン
グ、４７…リターンスプリング。1 ... Outer tube, 2 ... Inner tube, 5 ... Case, 6 ... Cylinder, 10 ... Hollow rod, 12 ... Piston, 26 ... Hollow shaft, 38 ... Diaphragm, 40 ...
Cylinder groove, 41 ... cotter, 42 ... cover, 43 ...
Grooved member, 44 ... Groove of grooved member, 46 ... Suspension spring, 47 ... Return spring.
Claims (1)
ロッドを挿入し、シリンダ内の一端部側に該ピストンロ
ッド外周面に摺接するオイルシールを取り付け、このシ
リンダの他端部側に隔壁部材を設けて気体室を画成する
とともにシリンダ内と前記オイルシール外側を連通する
圧力吸収機構を設けた油圧緩衝器において、前記圧力吸
収機構はシリンダ内にスプリングにて付勢される隔壁部
材を摺動自在に設け、この隔壁部材にて前記シリンダ内
の油室及びシリンダ外の油室とつながる気体室とを画成
し、この隔壁部材を貫通してシャフトを前記シリンダ内
に臨ませ、このシャフトの先端部側に圧側減衰力機構を
配設し、更にシャフト外周面に隔壁部材が所定位置まで
移動した際に隔壁部材にて画成される油室と気体室とを
連通せしめる連通路を形成したことを特徴とする油圧緩
衝器。1. A piston rod is inserted into a cylinder containing hydraulic oil, an oil seal is slidably attached to the outer peripheral surface of the piston rod at one end of the cylinder, and a partition member is provided at the other end of the cylinder. In a hydraulic shock absorber provided with a pressure absorbing mechanism that defines a gas chamber and communicates the inside of the cylinder with the outside of the oil seal, the pressure absorbing mechanism slides a partition wall member biased by a spring in the cylinder. The partition wall member defines a gas chamber that communicates with the oil chamber inside the cylinder and the oil chamber outside the cylinder, and the shaft faces the inside of the cylinder through the partition member. A communication passage that has a compression side damping force mechanism on the tip end side and further connects the oil chamber and the gas chamber defined by the partition wall member when the partition wall member moves to a predetermined position on the outer peripheral surface of the shaft. A hydraulic shock absorber characterized by being formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2056093A JP2870678B2 (en) | 1993-01-13 | 1993-01-13 | Hydraulic shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2056093A JP2870678B2 (en) | 1993-01-13 | 1993-01-13 | Hydraulic shock absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06147248A true JPH06147248A (en) | 1994-05-27 |
| JP2870678B2 JP2870678B2 (en) | 1999-03-17 |
Family
ID=12030553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2056093A Expired - Fee Related JP2870678B2 (en) | 1993-01-13 | 1993-01-13 | Hydraulic shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2870678B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005308168A (en) * | 2004-04-26 | 2005-11-04 | Kayaba Ind Co Ltd | Hydraulic shock absorber |
| JP2008232325A (en) * | 2007-03-22 | 2008-10-02 | Kayaba Ind Co Ltd | Front fork |
| JP2010025232A (en) * | 2008-07-18 | 2010-02-04 | Kayaba Ind Co Ltd | Front fork |
-
1993
- 1993-01-13 JP JP2056093A patent/JP2870678B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005308168A (en) * | 2004-04-26 | 2005-11-04 | Kayaba Ind Co Ltd | Hydraulic shock absorber |
| JP4526862B2 (en) * | 2004-04-26 | 2010-08-18 | カヤバ工業株式会社 | Hydraulic shock absorber |
| JP2008232325A (en) * | 2007-03-22 | 2008-10-02 | Kayaba Ind Co Ltd | Front fork |
| JP2010025232A (en) * | 2008-07-18 | 2010-02-04 | Kayaba Ind Co Ltd | Front fork |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2870678B2 (en) | 1999-03-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19981217 |
|
| LAPS | Cancellation because of no payment of annual fees |