JPH0178746U

JPH0178746U -

Info

Publication number: JPH0178746U
Application number: JP1987175534U
Authority: JP
Priority date: 1987-11-17
Filing date: 1987-11-17
Publication date: 1989-05-26
Anticipated expiration: 2002-11-17
Also published as: JPH06670Y2

Description

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

第１図は本考案の一実施例に係る油圧緩衝器の
一部切欠き縦断面正面図、第２図は第１図の一部
拡大断面図、第３図は減衰力特性を示すグラフ、
第４図は他の実施例に係る油圧緩衝器の一部拡大
断面図、第５図は第４図の実施例に係る減衰力特
性のグラフ、第６図は従来の油圧緩衝器の減衰力
特性を示すグラフである。１……シリンダ、２……ピストン、３……ピス
トンロツド、４，５……油室、６，７……ポート
、８……リーフバルブ、１０，１１……バイパス
、１４……ポペツト弁、１５……スプリング、１
７……プツシユロツド、１８……パイロツト通路
。 FIG. 1 is a partially cutaway vertical sectional front view of a hydraulic shock absorber according to an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of FIG. 1, and FIG. 3 is a graph showing damping force characteristics.
Fig. 4 is a partially enlarged sectional view of a hydraulic shock absorber according to another embodiment, Fig. 5 is a graph of damping force characteristics according to the embodiment of Fig. 4, and Fig. 6 is a damping force of a conventional hydraulic shock absorber. It is a graph showing characteristics. 1... Cylinder, 2... Piston, 3... Piston rod, 4, 5... Oil chamber, 6, 7... Port, 8... Leaf valve, 10, 11... Bypass, 14... Poppet valve, 15 ...Spring, 1
7...Pushboard, 18...Pilot passage.

Claims

【実用新案登録請求の範囲】 (1) シリンダ内にピストンを介してピストンロ
ツドが移動自在に挿入され、ピストンはシリンダ
内に上下二つの油室を区画し、ピストンとピスト
ンロツドには二つの油室を連通するポートとバイ
パスをそれぞれ設け、ピストンのポートの口端に
リーフバルブを開閉自在に設け、バイパスの途中
に開口面積を調節するバルブを設けた油圧緩衝器
に於て、前記バルブを移動自在なポペツト弁と当
該ポペツト弁を閉じ方向に附勢するスプリングと
で構成させ、ポペツト弁には下部油室の圧油を背
部に導くパイロツト通路を形成し、更にピストン
ロツド内にはポペツト弁に対向して当該ポペツト
弁の位置を規制するプツシユロツドを移動自在に
設けたことを特徴とする油圧緩衝器の減衰力調整
装置。 (2) プツシユロツドがポペツト弁に直接任意の
間隔を置いて対向している実用新案登録請求の範
囲第１項記載の油圧緩衝器の減衰力調整装置。 (3) ポペツト弁を附勢するスプリングの一端が
移動自在なフリーピストンに支持され、このフリ
ーピストンの背部にプツシユロツドが当接してい
る実用新案登録請求の範囲第１項記載の油圧緩衝
器の減衰力調整装置。 (4) プツシユロツドがアルミニユーム等の熱膨
張材料からなる実用新案登録請求の範囲第１項記
載の油圧緩衝器の減衰力調整装置。[Claims for Utility Model Registration] (1) A piston rod is movably inserted into the cylinder via a piston, the piston divides the cylinder into two upper and lower oil chambers, and the piston and piston rod have two oil chambers. In a hydraulic shock absorber, a communicating port and a bypass are respectively provided, a leaf valve is provided at the mouth end of the port of the piston so as to be freely openable and closable, and a valve for adjusting the opening area is provided in the middle of the bypass. It consists of a poppet valve and a spring that biases the poppet valve in the closing direction, and a pilot passage is formed in the poppet valve to guide the pressure oil in the lower oil chamber to the back, and a pilot passage is formed in the piston rod opposite to the poppet valve. A damping force adjustment device for a hydraulic shock absorber, characterized in that a push rod for regulating the position of the poppet valve is movably provided. (2) The damping force adjusting device for a hydraulic shock absorber according to claim 1, wherein the push rod directly faces the poppet valve at an arbitrary distance. (3) Damping of the hydraulic shock absorber according to claim 1, in which one end of the spring that energizes the poppet valve is supported by a movable free piston, and a push rod is in contact with the back of the free piston. Force adjustment device. (4) The damping force adjusting device for a hydraulic shock absorber according to claim 1, wherein the push rod is made of a thermal expansion material such as aluminum.