JPS636244U

JPS636244U -

Info

Publication number: JPS636244U
Application number: JP10024786U
Authority: JP
Priority date: 1986-06-30
Filing date: 1986-06-30
Publication date: 1988-01-16

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
縦断正面図、第２図は流路を示す回路図、第３図
は減衰力特性を示すグラフ、第４図は第１図の一
部拡大断面図、第５図、第６図はリーフバルブに
加わる力の関係を示す略示図、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
特性を示すグラフである。２０……シリンダ、２１……ピストン、２２…
…ピストンロツド、２３，２４……油室、３０…
…固定オリフイス、３７……通路たる中空部、３
８……可変オリフイス、４４……圧側メインバル
ブ、５０，５１……ポート、５２……圧力室、Ａ
２……圧側リーフバルブ。 Fig. 1 is a longitudinal sectional front view of a hydraulic shock absorber according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing the flow path, Fig. 3 is a graph showing damping force characteristics, and Fig. 4 is the same as Fig. 1. A partially enlarged sectional view, FIGS. 5 and 6 are schematic diagrams showing the relationship of forces applied to the leaf valve, FIG. 7 is a partially longitudinal front view of a conventional hydraulic shock absorber, and FIG. 8 is a conventional damping It is a graph showing characteristics. 20...Cylinder, 21...Piston, 22...
...Piston rod, 23, 24...Oil chamber, 30...
... Fixed orifice, 37 ... Hollow part serving as passage, 3
8...Variable orifice, 44...Pressure side main valve, 50, 51...Port, 52...Pressure chamber, A
2...Pressure side leaf valve.

Claims

[Claims for Utility Model Registration] (1) A piston rod is movably inserted into the cylinder via the piston, and the piston defines two oil chambers, a first oil chamber and a second oil chamber. The oil chamber communicates with the piston through two expansion and compression ports, and the piston is equipped with a hydraulic shock absorber with expansion and compression valves that open and close the expansion and compression ports on both ends of the piston. The pressure side valve is composed of a pressure side leaf valve that comes into contact with the upper end surface of the piston, and a pressure side main valve that comes into contact with the back side of the pressure side leaf valve, and a pressure chamber is provided at the back of the pressure side leaf valve. Second
A passage is provided for communicating the oil chamber of the oil chamber, and a second passage of this passage
A fixed orifice is provided on the oil chamber side, and a variable orifice that can be changed by a valve provided in the piston rod and a check valve on the expansion side are provided on the first oil chamber side, and a passageway between the fixed orifice and the variable orifice is provided. A damping force adjustment device for a hydraulic shock absorber, which communicates with the pressure chamber. (2) The damping force adjusting device for a hydraulic shock absorber according to claim 1, wherein the variable orifice communicates with the first oil chamber through a through hole provided in the piston rod and an expansion side check valve. (3) A control rod and a rotary valve are rotatably inserted into the piston rod, and a variable orifice provided in the rotary valve opens and closes in the through hole as the control rod rotates. A damping force adjustment device for a hydraulic shock absorber as described in . (4) The damping force adjusting device for a hydraulic shock absorber according to claim 3, wherein the opening area of the variable orifice relative to the through hole is sequentially increased or decreased as the control rod rotates. (5) The oil pressure according to claim 1 of the utility model registration, which forms a two-stage throttle in which the oil flowing through the fixed orifice and the variable orifice is firstly throttled by the fixed orifice and secondarily by the variable orifice. Shock absorber damping force adjustment device.