JPH0192536U

JPH0192536U -

Info

Publication number: JPH0192536U
Application number: JP18959287U
Authority: JP
Priority date: 1987-12-14
Filing date: 1987-12-14
Publication date: 1989-06-16
Anticipated expiration: 2002-12-14
Also published as: JPH06669Y2

Description

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

第１図は本考案の一実施例に係る油圧緩衝器の
を示す縦断正面図、第２図は従来例としての油圧
緩衝器を一部切り欠いて示す縦断正面図である。符号の説明、１…外筒、２…内筒、３…シリン
ダ、４…ピストン、５…ピストンロツド、６…隔
壁部材、６ａ…チエツク弁、７…伸側減衰バルブ
、８…圧側減衰バルブ、９…開放弁、９ａ…弁本
体、９ｂ…コイルスプリング、Ａ…上方油室、Ｂ
…下方油室、Ｃ…リザーバ室、Ｄ…ガス室、Ｒ…
バイパス路。 FIG. 1 is a longitudinal sectional front view showing a hydraulic shock absorber according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional front view showing a conventional hydraulic shock absorber with a portion cut away. Explanation of symbols: 1... Outer cylinder, 2... Inner cylinder, 3... Cylinder, 4... Piston, 5... Piston rod, 6... Partition member, 6a... Check valve, 7... Rebound side damping valve, 8... Compression side damping valve, 9 ...Release valve, 9a...Valve body, 9b...Coil spring, A...Upper oil chamber, B
...Lower oil chamber, C...Reservoir chamber, D...Gas chamber, R...
bypass road.

Claims

【実用新案登録請求の範囲】 (1) 下端内部に外部からの作動油の流入を許容
するチエツク弁を有するシリンダ内に摺動自在に
収装されると共にシリンダ内に挿通されたピスト
ンロツドの先端に連設されたピストンによつてシ
リンダ内に上方油室と下方油室とが区画形成され
、かつ、シリンダ内をピストンが下降する圧側行
程時に下方油室内の作動油が上方油室を介してシ
リンダ外のリザーバ室に流出するように形成され
てなる油圧緩衝器において、ピストンには伸側減
衰バルブおよび圧側減衰バルブが配設されてなる
と共に、ピストンロツド内には上方油室とリザー
バ室側とを連通するバイパス路が形成されてなり
、かつ、該バイパス路中にはシリンダ内をピスト
ンが下降する圧側行程時に下方油室内の油圧で作
動して該バイパス路を開放する開放弁が配設され
てなることを特徴とする油圧緩衝器。 (2) 開放弁が拡径されたバイパス路中に摺動自
在に収装されその前進時にバイパス路を遮断する
と共にその後退時にバイパス路を連通する弁本体
と、拡径されたバイパス路中に配設され弁本体を
前進方向に附勢するコイルスプリングとを有して
なる実用新案登録請求の範囲第１項記載の油圧緩
衝器。 (3) バイパス路の一端がリザーバ室上方のガス
室に開口してなる実用新案登録請求の範囲第１項
記載の油圧緩衝器。[Claims for Utility Model Registration] (1) A piston rod that is slidably housed in a cylinder that has a check valve inside its lower end that allows hydraulic oil to flow in from the outside, and that is inserted into the cylinder at the tip of the piston rod. An upper oil chamber and a lower oil chamber are defined in the cylinder by the pistons arranged in series, and during the pressure side stroke in which the piston descends inside the cylinder, the hydraulic oil in the lower oil chamber flows into the cylinder via the upper oil chamber. In a hydraulic shock absorber that is formed to flow into an external reservoir chamber, the piston is provided with a rebound damping valve and a compression damping valve, and the piston rod has an upper oil chamber and a reservoir chamber side. A communicating bypass passage is formed, and a release valve is disposed in the bypass passage, which is operated by hydraulic pressure in the lower oil chamber to open the bypass passage during a pressure side stroke in which the piston descends within the cylinder. A hydraulic shock absorber characterized by: (2) A release valve is slidably housed in the enlarged bypass passage, and a valve body that blocks the bypass passage when it moves forward and communicates with the bypass passage when it retreats; The hydraulic shock absorber according to claim 1, which is a registered utility model and includes a coil spring disposed to bias the valve body in the forward direction. (3) The hydraulic shock absorber according to claim 1, wherein one end of the bypass passage opens into the gas chamber above the reservoir chamber.