JPH034944U

JPH034944U -

Info

Publication number: JPH034944U
Application number: JP6585389U
Authority: JP
Priority date: 1989-06-06
Filing date: 1989-06-06
Publication date: 1991-01-18
Anticipated expiration: 2004-06-06
Also published as: JP2537802Y2

Description

[Brief explanation of drawings]

第１図は本考案一実施例の減衰力可変型液圧緩
衝器の要部を示す断面図、第２図は実施例の第１
ピストン及び第２ピストンの上面を示す平面図、
第３図は第１ピストンの下面を示す底面図、第４
図は第２ピストンの下面を示す底面図、第５図は
実施例の液圧回路図、第６図は実施例のベースを
示す断面図、第７図は第６図Ｅ部の拡大断面図、
第８図は実施例の伸行程時のピストン速度に対す
る減衰力特性図、第９図は実施例の圧行程におけ
るピストン速度に対する減衰力特性図である。Ａ……上部液室（第１液室）、Ｂ……下部液室
（第２液室）、Ｃ……中間室、Ｆ……バイパス路
、１……シリンダ、３……ピストンロツド、７…
…第１ピストン、７ｅ……第１伸側連通孔（第１
連通孔）、８ａ……第１伸側デイスクバルブ、８
ｂ……第２伸側デイスクバルブ、９……第２ピス
トン、９ｄ……第２内側開口窓、９ｅ……第２外
側開口窓、９ｆ……第２伸側内側シート面、９ｇ
……第２伸側外側シート面、９ｈ……第２伸側連
通孔（第２連通孔）、１５……調整子（可変オリ
フイス）、１５ｂ……第１オリフイス孔、１５ｃ
……第２オリフイス孔、１５ｄ……第３オリフイ
ス孔。 FIG. 1 is a sectional view showing the main parts of a variable damping force type hydraulic shock absorber according to an embodiment of the present invention, and FIG.
A plan view showing the top surfaces of the piston and the second piston,
Figure 3 is a bottom view showing the lower surface of the first piston;
The figure is a bottom view showing the lower surface of the second piston, Figure 5 is a hydraulic circuit diagram of the embodiment, Figure 6 is a sectional view showing the base of the embodiment, and Figure 7 is an enlarged sectional view of section E in Figure 6. ,
FIG. 8 is a characteristic diagram of damping force versus piston speed during the extension stroke of the embodiment, and FIG. 9 is a characteristic diagram of damping force versus piston speed during the compression stroke of the embodiment. A... Upper liquid chamber (first liquid chamber), B... Lower liquid chamber (second liquid chamber), C... Intermediate chamber, F... Bypass path, 1... Cylinder, 3... Piston rod, 7...
...First piston, 7e...First extension side communication hole (first
communication hole), 8a...first expansion side disc valve, 8
b...Second extension side disc valve, 9...Second piston, 9d...Second inner opening window, 9e...Second outer opening window, 9f...Second extension side inner seat surface, 9g
...Second extension side outer sheet surface, 9h...Second extension side communication hole (second communication hole), 15...Adjustor (variable orifice), 15b...First orifice hole, 15c
...Second orifice hole, 15d...Third orifice hole.

Claims

[Claims for Utility Model Registration] A first piston and a second piston are provided in series with the inside of the cylinder divided into a first liquid chamber and a second liquid chamber, and a hollow chamber is formed between them. , a first communication hole formed in the first piston to communicate one liquid chamber and the intermediate chamber, and a second communication hole formed in the second piston to communicate the other liquid chamber and the intermediate chamber. , a first disc valve provided on the first piston to open and close the first communication hole; and a second disc valve that abuts against the inner and outer double seat surfaces to open and close the second communication hole.
A second disc valve provided on the piston communicates one liquid chamber with the intermediate chamber in parallel with both communication holes, and connects one liquid chamber with one of the opening windows formed on the inside of both seat surfaces. A variable damping force type hydraulic shock absorber, comprising: a bypass path formed by communicating the two; and a variable orifice provided in the bypass path.