JPH0312002U

JPH0312002U -

Info

Publication number: JPH0312002U
Application number: JP7048889U
Authority: JP
Priority date: 1989-06-16
Filing date: 1989-06-16
Publication date: 1991-02-07

Description

[Brief explanation of drawings]

第１図はこの考案の第１実施例を示すピストン
位置制御装置の概略構成図、第２図及び第３図は
バルブ部材２９に形成した制御オリフイス３２を
示す断面図及び第２図のＢ−Ｂ線に沿う断面図、
第４図及び第５図はこの考案の第２実施例を示す
第１図及び第３図と同様な概略構成図及び断面図
、第６図及び第７図はこの考案の第３実施例を示
す第４図及び第５図と同様な概略構成図及び断面
図、第８図はこの考案の第４実施例を示す第４図
と同様な概略構成図、第９図及び第１０図はそれ
ぞれ従来のピストン位置制御装置を油圧の比例弁
に用いた異なる例を示す概略構成図、第１１図は
第９図の比例弁における問題点を説明するための
「弁差圧−流量」の関係を示す線図である。２１……ボデイ、２１ａ……摺動孔、２３……
パイロツト圧供給路、２４……ピストン、２４ａ
，４４ａ……一端面、２４ｂ，４４ｂ……端面、
２５……油圧源、２６……パイロツト油室、２７
……制御油室、２８……バルブ付勢スプリング、
２９……バルブ部材、３１，４５……入力ロツド
、３１ａ，４５ａ……先端部、３２……制御オリ
フイス、３３……操作ロツド（指令部材）、３４
，３８，６４……ドレーン油路、３５，６１……
排出油路、３７……タンク、４４……スプール（
ピストン）、４３……スプリング、４８……入力
ロツド付勢スプリング、４９……比例ソレノイド
、４９ａ……可動軸、５１……スプール内油路（
排出油路）。 FIG. 1 is a schematic configuration diagram of a piston position control device showing a first embodiment of this invention, and FIGS. 2 and 3 are sectional views showing a control orifice 32 formed in a valve member 29, and FIG. A cross-sectional view along line B,
4 and 5 are schematic configuration diagrams and sectional views similar to FIGS. 1 and 3 showing a second embodiment of this invention, and FIGS. 6 and 7 show a third embodiment of this invention. FIG. 8 is a schematic configuration diagram similar to FIG. 4 showing a fourth embodiment of this invention, and FIGS. 9 and 10 are respectively a schematic configuration diagram and a sectional view similar to FIGS. A schematic configuration diagram showing a different example in which a conventional piston position control device is used in a hydraulic proportional valve, and FIG. 11 shows the relationship between "valve differential pressure and flow rate" to explain the problem with the proportional valve shown in FIG. FIG. 21...Body, 21a...Sliding hole, 23...
Pilot pressure supply path, 24...Piston, 24a
, 44a... one end surface, 24b, 44b... end surface,
25...Hydraulic power source, 26...Pilot oil chamber, 27
...Control oil chamber, 28...Valve biasing spring,
29... Valve member, 31, 45... Input rod, 31a, 45a... Tip, 32... Control orifice, 33... Operation rod (command member), 34
, 38, 64...Drain oil path, 35, 61...
Discharge oil path, 37...Tank, 44...Spool (
piston), 43... Spring, 48... Input rod biasing spring, 49... Proportional solenoid, 49a... Movable shaft, 51... Oil passage in spool (
drain oil path).

Claims

[Claims for Utility Model Registration] 1. A piston is slidably provided in a sliding hole formed in the body, and a force from a spring or pilot oil pressure is applied to one end surface of the piston to push it in one direction. A valve member having a control oil chamber formed on the end face side of the piston on the tip side in the pressing direction, one end face of the control oil chamber being pressed by a valve biasing spring, and the other end face being pressed against the end face of the piston. The tip of the input rod is slidably fitted into the valve member along the sliding direction of the piston, and the hydraulic pressure in the control oil chamber is controlled by the tip of the input rod and the valve member. A pilot which forms a control orifice to be adjusted, connects or engages the rear end of the input rod with a command member for adjusting the opening degree of the control orifice, and supplies pressure oil to the control oil chamber through the orifice. A piston position control device characterized in that a pressure supply passage is formed in the body, and a discharge oil passage for guiding discharged oil from the control oil chamber to a drain oil passage is formed in the piston or the input rod. 2. The piston position control device according to claim 1, wherein the command member is a proportional solenoid, and the input rod is provided with an input rod biasing spring that presses and engages the input rod with the movable shaft of the command member. piston position control device.