JPS62174135U

JPS62174135U -

Info

Publication number: JPS62174135U
Application number: JP6284486U
Authority: JP
Priority date: 1986-04-25
Filing date: 1986-04-25
Publication date: 1987-11-05

Description

[Brief explanation of the drawing]

第１図は本考案の油圧緩衝器の一部切欠き縦断
正面図、第２図は減衰力特性を示すグラフ、第３
図は第１図の―線から見たピストンの右側面
図、第４図は従来の油圧緩衝器の一部切欠き縦断
正面図、第５図は第４図の―線横断右側図面
、第６図は従来の減衰力特性を示すグラフである
。２……シリンダ、３……ピストン、４……ピス
トンロツド、１３……固定オリフイス、２１……
通路、２７……ノーマル用ポート、２８……ハー
ド用ポート、３５……リーフバルブ、Ａ，Ｂ……
油室。 Figure 1 is a partially cutaway longitudinal sectional front view of the hydraulic shock absorber of the present invention, Figure 2 is a graph showing damping force characteristics, and Figure 3 is a graph showing the damping force characteristics.
The figures are a right side view of the piston seen from the - line in Fig. 1, Fig. 4 is a partially cutaway longitudinal sectional front view of a conventional hydraulic shock absorber, and Fig. 5 is a right side view across the - line in Fig. 4. FIG. 6 is a graph showing conventional damping force characteristics. 2... Cylinder, 3... Piston, 4... Piston rod, 13... Fixed orifice, 21...
Passage, 27...Normal port, 28...Hard port, 35...Leaf valve, A, B...
Oil room.

Claims

[Claims for Utility Model Registration] (1) A piston rod is movably inserted into the cylinder via a piston, and the piston is provided with a port that communicates with the upper and lower oil chambers partitioned by the piston. In a hydraulic shock absorber, a leaf valve is provided at the end of the mouth so that it can be opened and closed freely.In the hydraulic shock absorber, an independent hard groove and a normal groove are formed on the end face of the piston, and a leaf valve is installed to close these grooves. is provided with a hard port and a normal port corresponding to the hard groove and normal groove, and a rotary valve is rotatably inserted into the piston rod, and the rotary valve is provided with a passage through which the two upper and lower oil chambers communicate. A fixed orifice is provided in the middle of this passage, and the passage can be selectively communicated with or shut off to the hard port or the normal port, and the hard groove provided on the end face of the piston is connected to the leaf valve. A hydraulic shock absorber characterized in that the opening pressure receiving area is smaller than the normal groove provided on the end face of the piston, or the opening position is formed inside the normal groove. (2) The hydraulic shock absorber according to claim 1, wherein the hard groove and the normal groove provided on the end face of the piston that communicate with the hard port and the normal port are semicircular. (3) The hydraulic shock absorber according to claim 1, wherein the area of the hard groove is smaller than that of the normal groove. (4) The hydraulic shock absorber according to claim 1, wherein the fixed orifice is provided at the lower end of a hollow rotary valve.