JPS6348044U

JPS6348044U -

Info

Publication number: JPS6348044U
Application number: JP14154186U
Authority: JP
Priority date: 1986-09-16
Filing date: 1986-09-16
Publication date: 1988-04-01
Also published as: JPH0424197Y2

Description

[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
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図は他の実施例に係る油
圧緩衝器の一部縦断正面図、第７図は従来の油圧
緩衝器の一部縦断正面図、第８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、３６…ポート、
２９…第２のリーフバルブ、３１…第１のリーフ
バルブ、３６ａ…第１のバイパス、３６ｂ…第２
のバイパス、３９…ロータリーバルブ、５０…デ
イスク、５３…可変オリフイス。 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 5 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 hydraulic shock absorber according to another embodiment, and FIG. 7 is a graph of a conventional hydraulic shock absorber. FIG. 8, a partially longitudinal front view, is a graph showing conventional damping force characteristics. 17...Cylinder, 18...Piston, 19...Piston rod, 21, 22...Oil chamber, 36...Port,
29...second leaf valve, 31...first leaf valve, 36a...first bypass, 36b...second
bypass, 39...rotary valve, 50...disc, 53...variable orifice.

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 leaf valve is provided at the upper end of the port so as to be openable and closable, and the piston rod is provided with a disk above the piston, and this disk and the piston rod are provided with a first leaf valve that communicates with the upper and lower oil chambers. Provide a bypass for
A second leaf valve is provided at the upper oil chamber side mouth end of the first bypass so as to be openable and closable, and the first bypass is further connected to a second bypass that opens to the upper oil chamber, and the first and second leaf valves are connected to each other. A damping force adjustment device for a hydraulic shock absorber, characterized in that a valve for adjusting the opening area of each bypass is provided in the bypass. (2) The damping force adjusting device for a hydraulic shock absorber according to claim 1, wherein the first and second leaf valves are valves for common use in expansion. (3) 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 provided with a variable port that opens and closes on the first bypass and a variable orifice that opens and closes on the second bypass. Shock absorber damping force adjustment device. (4) The damping force adjusting device for a hydraulic shock absorber according to claim 1, wherein the second bypass is provided on the piston rod. (5) The damping force adjusting device for a hydraulic shock absorber according to claim 1, wherein the second bypass is provided in a plate interposed between the piston and the disk.