JPS6357835U

JPS6357835U -

Info

Publication number: JPS6357835U
Application number: JP15228286U
Authority: JP
Priority date: 1986-10-03
Filing date: 1986-10-03
Publication date: 1988-04-18
Anticipated expiration: 2001-10-03
Also published as: JPH0516423Y2

Description

[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
一部縦断正面図、第２図は第１図のピストン部の
拡大断面図、第３図はバルブ部の回路図、第４図
は圧力―流量特性を示すグラフ、第５図は減衰力
特性を示すグラフ、第６図は従来の油圧緩衝器の
一部縦断正面図、第７図は従来の減衰力特性を示
すグラフである。１７……シリンダ、１８……ピストン、１９…
…ピストンロツド、２１，２２……油室、３６ａ
……第１のポート、３６ｂ……第２のポート、２
９……第１のリーフバルブ、３１……第２のリー
フバルブ、３６ｃ，３６ｄ……分岐通路、３９…
…ロータリーバルブ。 Fig. 1 is a partially vertical front view of a hydraulic shock absorber according to an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the piston section of Fig. 1, Fig. 3 is a circuit diagram of the valve section, and Fig. 4 is a graph showing the pressure-flow characteristics, Fig. 5 is a graph showing the damping force characteristics, Fig. 6 is a partially longitudinal front view of a conventional hydraulic shock absorber, and Fig. 7 is a graph showing the conventional damping force characteristics. . 17...Cylinder, 18...Piston, 19...
...Piston rod, 21, 22...Oil chamber, 36a
...First port, 36b...Second port, 2
9...first leaf valve, 31...second leaf valve, 36c, 36d...branch passage, 39...
...Rotary valve.

Claims

[Claims for Utility Model Registration] (1) A piston rod is movably inserted into the cylinder via a piston, the piston defines two upper and lower oil chambers in the cylinder, and the two oil chambers communicate with the piston. A first port and a second port are formed, and a first leaf valve for expansion and compression is provided at the upper mouth end of the first port so as to be openable and closable.
A second leaf valve for common expansion and compression is provided at the lower mouth end of the port, and a branch passage is provided in the piston rod to communicate the first port and the upper oil chamber with the lower oil chamber. A damping force adjustment device for a hydraulic shock absorber, characterized in that a valve for adjusting an opening area of the branch passage is provided in the branch passage. (2) The damping force adjustment device for a hydraulic shock absorber according to claim 1, wherein the second leaf valve that opens and closes the lower mouth end of the second port is always biased in the closing direction by a spring. . (3) The damping force adjusting device for a hydraulic shock absorber according to claim 2, wherein a hollow valve having a through hole is interposed between the second leaf valve and the spring. (4) The hydraulic pressure according to claim 1 of the utility model registration claim, wherein the valve for adjusting the opening area is a rotary valve having a variable port that opens and closes in the first port and a variable orifice that opens and closes in the upper oil chamber. Shock absorber damping force adjustment device.