JPH0230709U

JPH0230709U -

Info

Publication number: JPH0230709U
Application number: JP10945188U
Authority: JP
Priority date: 1988-08-20
Filing date: 1988-08-20
Publication date: 1990-02-27
Anticipated expiration: 2003-08-20
Also published as: JPH0716484Y2

Description

[Brief explanation of drawings]

第１図は本考案の第１の実施例を示すサスペン
シヨン装置の油圧回路図、第２図および第３図は
第２の実施例を示し、第２図はサスペンシヨン装
置の要部縦断面図、第３図は第２図中の部分拡大
図、第４図および第５図は第３の実施例を示し、
第４図は第２図と同様の要部縦断面図、第５図は
第４図中の部分拡大図、第６図乃至第８図は従来
技術を示し、第６図はサスペンシヨン装置の油圧
回路図、第７図はサスペンシヨン装置の要部縦断
面図、第８図は第７図中の部分拡大図である。１……油圧ポンプ、２……タンク、６……供給
配管、７……切換弁、８……給排管、９……戻し
配管、１０……シリンダ、１０Ａ，１０Ｂ……油
室、１１……ピストン、１２……ピストンロツド
、１３……連通穴、１６……減衰力発生機構、１
７……アキユムレータ、１８……外筒、１９……
内筒、２１……ロツドガイド、２２……ドレン室
、２３……金属シール、２４……Ｏリング（ロツ
ドシール）、２５……合成樹脂リング（ロツドシ
ール）、２８……ダストシール、２９，３０……
ドレン溝、３１……ドレン配管、４１……チエツ
ク弁、５１，６１……リツプシール（チエツク弁
）、５２，６２……芯金、５３，６３……弾性体
。 Fig. 1 is a hydraulic circuit diagram of a suspension device showing a first embodiment of the present invention, Figs. 2 and 3 show a second embodiment, and Fig. 2 is a vertical cross-section of main parts of the suspension device. 3 shows a partially enlarged view of FIG. 2, and FIGS. 4 and 5 show a third embodiment,
Fig. 4 is a vertical sectional view of the main part similar to Fig. 2, Fig. 5 is a partially enlarged view of Fig. 4, Figs. 6 to 8 show the conventional technology, and Fig. 6 is a suspension device. A hydraulic circuit diagram, FIG. 7 is a vertical cross-sectional view of a main part of the suspension device, and FIG. 8 is a partially enlarged view of FIG. 7. 1... Hydraulic pump, 2... Tank, 6... Supply piping, 7... Switching valve, 8... Supply/discharge pipe, 9... Return piping, 10... Cylinder, 10A, 10B... Oil chamber, 11 ... Piston, 12 ... Piston rod, 13 ... Communication hole, 16 ... Damping force generation mechanism, 1
7...Accumulator, 18...Outer tube, 19...
Inner cylinder, 21... Rod guide, 22... Drain chamber, 23... Metal seal, 24... O ring (rod seal), 25... Synthetic resin ring (rod seal), 28... Dust seal, 29, 30...
Drain groove, 31... Drain piping, 41... Check valve, 51, 61... Lip seal (check valve), 52, 62... Core metal, 53, 63... Elastic body.

Claims

[Scope of utility model registration request]

an outer cylinder, an inner cylinder disposed within the outer cylinder, a piston slidably fitted into the inner cylinder, one end fixed to the piston and the other end a rod guide;
In order to supply and discharge pressure oil to and from the piston rod that protrudes outside the outer cylinder through the rod seal provided on the rod guide and the dust seal, and the oil chamber in the inner cylinder through the piston rod, the oil chamber is operated by a hydraulic pump. a switching valve selectively connected to a supply pipe connected to the tank and a return pipe connected to the tank; and a drain formed between the outer cylinder and the inner cylinder to collect oil leaked from the inner cylinder via the oil seal. In a suspension device comprising a chamber and a drain pipe connected to the drain chamber and the return pipe in order to discharge the oil in the drain chamber to the tank side, pressure oil from the return pipe is discharged during oil draining. A suspension characterized in that a check valve is provided at a suitable location between the connection point of the drain pipe to the return pipe and the dust seal in order to prevent the dust seal from acting on the dust seal through the drain pipe and the drain chamber. Device.