JP2002235788A - Damping force adjusting mechanism for hydraulic shock absorber - Google Patents

Damping force adjusting mechanism for hydraulic shock absorber

Info

Publication number
JP2002235788A
JP2002235788A JP2001069425A JP2001069425A JP2002235788A JP 2002235788 A JP2002235788 A JP 2002235788A JP 2001069425 A JP2001069425 A JP 2001069425A JP 2001069425 A JP2001069425 A JP 2001069425A JP 2002235788 A JP2002235788 A JP 2002235788A
Authority
JP
Japan
Prior art keywords
flow path
bypass flow
damping force
hydraulic oil
oil chamber
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.)
Pending
Application number
JP2001069425A
Other languages
Japanese (ja)
Inventor
Sadao Sakugi
貞雄 柵木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP2001069425A priority Critical patent/JP2002235788A/en
Publication of JP2002235788A publication Critical patent/JP2002235788A/en
Pending legal-status Critical Current

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  • Fluid-Damping Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To enable a delicate adjustment of damping force of a hydraulic shock absorber. SOLUTION: A mechanism is constructed such that, inside a piston rod a bypass flow path A opened to the side of an operating oil chamber 2, a bypass flow path B opened to the side of an operating oil chamber 1 and a bypass flow path C are formed, the bypass flow path A, B and A, C are communicated with each other, the damping force in an extension/pressure side is adjusted by changing a flow path area by means of a hollow needle valve arranged to freely forward/backward move between the bypass flow paths A, B, a check valve is disposed so as to permit the flow of operating oil only at the compression time of the piston rod in a flow path connecting the bypass flow path A, C, and damping force in a pressure side is made adjustable by changing the flow path area by means of a needle valve arranged to freely forward/ backward move in the inside of the hollow needle valve. Accordingly, the damping force in the pressure side can be adjusted.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、伸側と圧側の双方の減
衰力調整と、圧側の減衰力調整が行える機構を併せ持っ
た構造の減衰力調整機構に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damping force adjusting mechanism having a structure capable of adjusting both the damping force on the extension side and the compression side and the mechanism for adjusting the damping force on the compression side.

【0002】[0002]

【従来の技術】従来の油圧緩衝器においては、作動油が
充填されるシリンダ内にピストンを介して摺動するピス
トンロッドが配設され、シリンダ内がピストンを境とし
て作動油室1と作動油室2に区画され、ピストンには作
動油室1と作動油室2を連通する圧側流路及び伸側流路
が形成されると共に、ピストン端面には圧側減衰バル
ブ、伸側減衰バルブがそれぞれ設けられ、ピストンロッ
ドには作動油室1と作動油室2を連通するバイパス流路
が形成されると共に、このバイパス流路の開口面積を変
更可能とするニードル弁が配設された減衰力調整機構が
知られている。
2. Description of the Related Art In a conventional hydraulic shock absorber, a piston rod that slides through a piston is provided in a cylinder filled with hydraulic oil, and a hydraulic oil chamber 1 and a hydraulic oil are provided in the cylinder with the piston as a boundary. The piston is formed with a compression-side flow path and an expansion-side flow path that communicate the hydraulic oil chamber 1 and the hydraulic oil chamber 2, and a compression-side damping valve and an expansion-side damping valve are provided on the piston end surface, respectively. A damping force adjusting mechanism is formed in the piston rod and has a bypass flow path communicating the hydraulic oil chamber 1 and the hydraulic oil chamber 2 and a needle valve that can change the opening area of the bypass flow path. It has been known.

【0003】[0003]

【発明が解決しようとする課題】従来の技術に示した減
衰力調整機構においては、ピストンロッドの伸長時、圧
縮時共、作動油が同一のバイパス流路を通過することと
なるため、圧側減衰力と伸側減衰力が共に変化してしま
う。そのため、圧側と伸側の減衰力をきめ細かく調整を
行うことができなかった。そのため、従来の伸側減衰
力、圧側減衰力双方の調整機構に加え、圧側の減衰力調
整が独立して行える機構を付加することで、きめ細かな
減衰力調整が行えるようにすることを課題として研究を
すすめた。
In the damping force adjusting mechanism shown in the prior art, the hydraulic oil passes through the same bypass flow path both when the piston rod is extended and when it is compressed. Both the force and the extension damping force change. Therefore, it was not possible to finely adjust the damping force on the compression side and the extension side. Therefore, in addition to the conventional mechanism for adjusting both the extension damping force and the compression damping force, a mechanism that allows independent adjustment of the compression damping force has been added, so that fine damping force adjustment can be performed. I promoted my research.

【0004】[0004]

【課題を解決するための手段】油圧緩衝器のシリンダ内
に、先端部にピストンを有するピストンロッドが配置さ
れ、該ピストンを境としてシリンダ内にピストンロッド
側の作動油室1と反対側の作動油室2を形成し、該ピス
トンには作動油室1と作動油室2を連通する圧側流路と
伸側流路が設けられると共に、該流路の各々に減衰力を
発生するバルブを有する油圧緩衝器において、ピストン
ロッド内には作動油室2側に開口するバイパス流路Aと
作動油室1側に開口するバイパス流路B,バイパス流路
Cを有し、バイパス流路Aとバイパス流路B、及びバイ
パス流路Aとバイパス流路Cは互いに連通されてなり、
バイパス流路Aとバイパス流路Bの間に進退自在に配在
された中空ニードル弁により流路面積を変化させること
で伸側と圧側の減衰力を調整し、バイパス流路Aとバイ
パス流路Cを連通する流路にはピストンロッドの圧縮時
に限り作動油の流れを許容するチェック弁を配すると共
に、中空ニードル弁の内部に進退自在に配在されたニー
ドル弁により流路面積を変化させることで圧側の減衰力
を調整することが可能な構造とすることにより上記課題
を解決した。
A piston rod having a piston at a distal end is disposed in a cylinder of a hydraulic shock absorber, and an operation of the hydraulic oil chamber 1 on a side opposite to the hydraulic oil chamber 1 on the piston rod side is provided in the cylinder with the piston as a boundary. An oil chamber 2 is formed, and the piston is provided with a pressure-side flow path and a growth-side flow path that communicate the hydraulic oil chamber 1 with the hydraulic oil chamber 2, and each of the flow paths has a valve that generates a damping force. In the hydraulic shock absorber, the piston rod has a bypass flow path A opened to the hydraulic oil chamber 2 side and a bypass flow path B and a bypass flow path C opened to the hydraulic oil chamber 1 side. The flow path B, and the bypass flow path A and the bypass flow path C are communicated with each other,
By changing the flow path area by a hollow needle valve disposed between the bypass flow path A and the bypass flow path B so as to be able to advance and retreat, the damping force on the extension side and the compression side is adjusted. A check valve that allows the flow of hydraulic oil only when the piston rod is compressed is disposed in the flow path communicating C, and the flow path area is changed by a needle valve that is disposed inside the hollow needle valve so as to advance and retreat. This has solved the above problem by providing a structure capable of adjusting the compression-side damping force.

【0005】[0005]

【作用】本発明は以上のような構成であることから、減
衰力をきめ細かく調整することが可能である。
According to the present invention having the above-described structure, it is possible to finely adjust the damping force.

【0006】[0006]

【実施例】本発明を実施するに当り、減衰力調整機構を
下記の構成とした。油圧緩衝器は作動油が充填されるシ
リンダ内にピストンを介して摺動するピストンロッドが
配設されて、該ピストンロッドの先端にはサブピストン
ロッドが螺合されており、シリンダ内はピストンを境と
してピストンロッドを収容する作動油室1と作動油室2
に区画され、ピストンには作動油室1と作動油室2を連
通する圧側流路及び伸側流路が形成されると共に、ピス
トンの作動油室1側の端面には円環状の圧側減衰バルブ
が、作動油室2側の端面には円環状の伸側減衰バルブが
それぞれ着座している。サブピストンロッドは鍔形状部
を有し、圧側減衰バルブをピストンとの間で挟持してい
る。サブピストンロッド内部には作動油室1と作動油室
2を連通するバイパス流路A,バイパス流路B,バイパ
ス流路Cが設けられており、バイパス流路Aとバイパス
流路B、及びバイパス流路Aとバイパス流路Cは互いに
連通している。サブピストンロッドのバイパス流路Cの
作動油室1への開口孔側には板状チェック弁が配在され
ており、板状チェック弁はチェック弁ストッパとサブピ
ストンロッドの鍔形状部により挟持されている。該板状
チェック弁はピストンロッドの伸長時には作動油の流入
を遮断し、圧縮時には作動油を流出させる。伸側減衰バ
ルブはピストンと伸側バルブストッパにより挟持されて
おり、サブピストンロッドに配在された各部材はナット
により固定されている。中空のピストンロッド内には、
中空プッシュロッドと中実プッシュロッドが同一中心軸
となるよう、且つ進退自在に挿通されている。中空プッ
シュロッドの後端は中実プッシュロッドに貫通する形で
配在された中継部材に接しており、中継部材は調整ネジ
取付部材に回動自在にねじ結合された調整ネジ1に接し
ている。中空プッシュロッドの先端はピストンロッド内
に摺動自在に配設された中空ニードル弁に接しており、
即ち調整ネジ1の軸方向の動きが中空プッシュロッドを
経由し、中空ニードル弁に伝達されることになる。中空
ニードル弁にはバイパス流路Aからバイパス流路Cへ作
動油が連通可能となるよう、側面に中心軸に対して直交
方向に孔が開けられており、又、サブピストンロッド側
には中空ニードル弁が上下した場合でも作動油の連通を
保てるように中空ニードル弁側面の孔に面する部分の外
周に上下動の幅に対応したザグリを設けている。尚、中
空ニードル弁外周にはOリングAを装着し、シリンダ内
の作動油の漏出を防いでいる。中実プッシュロッドの後
端は調整ネジ1に回動自在にねじ結合された調整ネジ2
に接しており、中実プッシュロッドの先端はニードル弁
に接している。即ち調整ネジ2の軸方向の動きが中実プ
ッシュロッドを経由し、ニードル弁に伝達されることに
なる。尚、ニードル弁の外周にはOリングBを装着し、
シリンダ内の作動油の漏出を防いでいる。前述の構造に
より、中空ニードル弁は軸方向に移動することにより、
サブピストンロッドに設けられたバイパス流路Aとバイ
パス流路Bを連通する流路の面積を変化させることで圧
側と伸側の減衰力を調整が可能となり、又、ニードル弁
は中空ニードル弁内で軸方向に移動することにより、バ
イパス流路Aとバイパス流路Cを連通する流路の面積を
変化させることで圧側の減衰力を調整可能とした。尚、
本実施例においてはチェック弁機構に板状チェック弁を
使用しているが他の形態チェック弁により作動油の流入
を遮断してもよい。
DESCRIPTION OF THE PREFERRED EMBODIMENTS In implementing the present invention, a damping force adjusting mechanism has the following configuration. The hydraulic shock absorber has a piston rod that slides through a piston in a cylinder filled with hydraulic oil, and a sub-piston rod is screwed to a tip of the piston rod. Hydraulic oil chamber 1 and hydraulic oil chamber 2 containing piston rods as boundaries
The piston is formed with a pressure-side flow path and an expansion-side flow path that communicate the hydraulic oil chamber 1 and the hydraulic oil chamber 2, and an annular pressure-side damping valve is provided on an end face of the piston on the hydraulic oil chamber 1 side. However, on the end face on the hydraulic oil chamber 2 side, annular extension-side damping valves are respectively seated. The sub-piston rod has a flange-shaped portion, and clamps the compression-side damping valve between the piston and the piston. A bypass flow path A, a bypass flow path B, and a bypass flow path C that connect the hydraulic oil chamber 1 and the hydraulic oil chamber 2 are provided inside the sub piston rod, and the bypass flow path A, the bypass flow path B, and the bypass flow path are provided. The channel A and the bypass channel C communicate with each other. A plate-shaped check valve is disposed on the side of the bypass passage C of the sub-piston rod toward the opening of the hydraulic oil chamber 1, and the plate-shaped check valve is sandwiched between the check valve stopper and the flange-shaped portion of the sub-piston rod. ing. The plate-like check valve blocks the inflow of hydraulic oil when the piston rod is extended, and allows the hydraulic oil to flow out when compressed. The extension side damping valve is sandwiched between the piston and the extension side valve stopper, and each member disposed on the sub piston rod is fixed by a nut. Inside the hollow piston rod,
The hollow push rod and the solid push rod are inserted so as to have the same central axis and to be able to advance and retreat. The rear end of the hollow push rod is in contact with a relay member disposed so as to penetrate the solid push rod, and the relay member is in contact with an adjusting screw 1 rotatably screwed to an adjusting screw mounting member. . The tip of the hollow push rod is in contact with the hollow needle valve slidably arranged in the piston rod,
That is, the axial movement of the adjusting screw 1 is transmitted to the hollow needle valve via the hollow push rod. The hollow needle valve is provided with a hole in the side surface in a direction orthogonal to the central axis so that hydraulic oil can be communicated from the bypass flow path A to the bypass flow path C. A counterbore corresponding to the vertical movement width is provided on the outer periphery of the portion facing the hole on the side surface of the hollow needle valve so as to maintain the communication of the hydraulic oil even when the needle valve moves up and down. An O-ring A is attached to the outer periphery of the hollow needle valve to prevent leakage of hydraulic oil in the cylinder. The rear end of the solid push rod is an adjusting screw 2 rotatably screwed to the adjusting screw 1.
, And the tip of the solid push rod is in contact with the needle valve. That is, the axial movement of the adjusting screw 2 is transmitted to the needle valve via the solid push rod. An O-ring B is attached to the outer periphery of the needle valve,
This prevents leakage of hydraulic oil in the cylinder. With the structure described above, the hollow needle valve moves in the axial direction,
By changing the area of the flow path connecting the bypass flow path A and the bypass flow path B provided in the sub-piston rod, the damping force on the compression side and the expansion side can be adjusted. By moving in the axial direction, the pressure-side damping force can be adjusted by changing the area of the flow path connecting the bypass flow path A and the bypass flow path C. still,
In the present embodiment, a plate-shaped check valve is used for the check valve mechanism, but the inflow of hydraulic oil may be blocked by another type of check valve.

【0007】[0007]

【発明の効果】本発明は以上のような構成であるため、
ピストンロッド部内の調整機構のみで伸側と圧側の減衰
力をきめ細かく調整できる。
Since the present invention has the above-described configuration,
The damping force on the extension side and the compression side can be finely adjusted only by the adjustment mechanism in the piston rod part.

【図面の簡単な説明】[Brief description of the drawings]

【図1】減衰力調整機構を示した断面図である。FIG. 1 is a sectional view showing a damping force adjusting mechanism.

【図2】減衰力調整機構のピストン部周辺を示した拡大
図である。
FIG. 2 is an enlarged view showing the vicinity of a piston portion of a damping force adjusting mechanism.

【図3】減衰力調整機構における作動油の流れを示した
断面図である。
FIG. 3 is a sectional view showing a flow of hydraulic oil in a damping force adjusting mechanism.

【符号の説明】[Explanation of symbols]

1 調整ネジ1 2 中継部材 3 調整ネジ2 4 調整ネジ取付部材 5 中実プッシュロッド 6 中空プッシュロッド 7 ピストンロッド 8 OリングA 9 OリングB 10 中空ニードル弁 11 ニードル弁 12 チェック弁ストッパ 13 板状チェック弁 14 圧側減衰バルブ 15 ピストン 16 伸側減衰バルブ 17 伸側バルブストッパ 18 サブピストンロッド 19 ナット 20 伸側流路 21 圧側流路 22 バイパス流路A 23 バイパス流路B 24 バイパス流路C 25 シリンダ 26 作動油室1 27 作動油室2 DESCRIPTION OF SYMBOLS 1 Adjusting screw 1 2 Relay member 3 Adjusting screw 2 4 Adjusting screw mounting member 5 Solid push rod 6 Hollow push rod 7 Piston rod 8 O-ring A 9 O-ring B 10 Hollow needle valve 11 Needle valve 12 Check valve stopper 13 Plate shape Check valve 14 Compression-side damping valve 15 Piston 16 Extension-side damping valve 17 Extension-side valve stopper 18 Sub-piston rod 19 Nut 20 Extension-side flow path 21 Compression-side flow path 22 Bypass flow path A 23 Bypass flow path B 24 Bypass flow path C 25 Cylinder 26 Hydraulic oil chamber 1 27 Hydraulic oil chamber 2

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 シリンダ内に、先端部にピストンを有
するピストンロッドが配置され、該ピストンを境として
シリンダ内にピストンロッド側の作動油室1と反対側の
作動油室2を形成し、該ピストンには作動油室1と作動
油室2を連通する圧側流路と伸側流路が設けられると共
に、該流路の各々に減衰力を発生するバルブを有する油
圧緩衝器において、ピストンロッド内には作動油室2側
に開口するバイパス流路Aと作動油室1側に開口するバ
イパス流路B,バイパス流路Cを有し、バイパス流路A
とバイパス流路B、及びバイパス流路Aとバイパス流路
Cは互いに連通されてなり、バイパス流路Aとバイパス
流路Bの間に進退自在に配在された中空ニードル弁によ
り流路面積を変化させることで伸側と圧側の減衰力を調
整し、バイパス流路Aとバイパス流路Cを連通する流路
にはピストンロッドの圧縮時に限り作動油の流れを許容
するチェック弁を配すると共に、中空ニードル弁の内部
に進退自在に配在されたニードル弁により流路面積を変
化させることで圧側の減衰力を調整することが可能な構
造の減衰力調整機構。
A piston rod having a piston at a tip portion is disposed in a cylinder, and a hydraulic oil chamber 2 opposite to a piston rod-side hydraulic oil chamber 1 is formed in the cylinder with the piston as a boundary. In a hydraulic shock absorber having a pressure side flow path and an extension side flow path communicating the hydraulic oil chamber 1 and the hydraulic oil chamber 2 with the piston, and having a valve for generating a damping force in each of the flow paths, a piston rod is provided. Has a bypass flow path A opening to the hydraulic oil chamber 2 side and a bypass flow path B and a bypass flow path C opening to the hydraulic oil chamber 1 side.
And the bypass flow path B, and the bypass flow path A and the bypass flow path C are communicated with each other. By adjusting the damping force on the extension side and the compression side by changing the pressure, a check valve that allows the flow of hydraulic oil only when the piston rod is compressed is arranged in the flow path that connects the bypass flow path A and the bypass flow path C, and A damping force adjusting mechanism having a structure capable of adjusting a pressure-side damping force by changing a flow path area by a needle valve disposed to be able to advance and retreat inside a hollow needle valve.
JP2001069425A 2001-02-06 2001-02-06 Damping force adjusting mechanism for hydraulic shock absorber Pending JP2002235788A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001069425A JP2002235788A (en) 2001-02-06 2001-02-06 Damping force adjusting mechanism for hydraulic shock absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001069425A JP2002235788A (en) 2001-02-06 2001-02-06 Damping force adjusting mechanism for hydraulic shock absorber

Publications (1)

Publication Number Publication Date
JP2002235788A true JP2002235788A (en) 2002-08-23

Family

ID=18927459

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001069425A Pending JP2002235788A (en) 2001-02-06 2001-02-06 Damping force adjusting mechanism for hydraulic shock absorber

Country Status (1)

Country Link
JP (1) JP2002235788A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011122623A (en) * 2009-12-09 2011-06-23 Kyb Co Ltd Adjusting device
JP2011252526A (en) * 2010-06-01 2011-12-15 Kyb Co Ltd Fluid pressure buffer
DE102014112523A1 (en) * 2014-09-01 2016-03-17 Wp Performance Systems Gmbh Vibration damper with independently adjustable damping for rebound and compression
JP6198926B1 (en) * 2016-12-19 2017-09-20 株式会社キャロッセ Hydraulic shock absorber

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011122623A (en) * 2009-12-09 2011-06-23 Kyb Co Ltd Adjusting device
JP2011252526A (en) * 2010-06-01 2011-12-15 Kyb Co Ltd Fluid pressure buffer
DE102014112523A1 (en) * 2014-09-01 2016-03-17 Wp Performance Systems Gmbh Vibration damper with independently adjustable damping for rebound and compression
JP6198926B1 (en) * 2016-12-19 2017-09-20 株式会社キャロッセ Hydraulic shock absorber

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