JPS5939373U

JPS5939373U - Pressure reducing valve type pilot valve

Info

Publication number: JPS5939373U
Application number: JP13600982U
Authority: JP
Inventors: 渉大津; 勇作野沢
Original assignee: 日立建機株式会社
Priority date: 1982-09-08
Filing date: 1982-09-08
Publication date: 1984-03-13

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図ないし第５図は従来技術を示すものであって、第
１図は減圧弁型パイロット弁の縦断面図、第２図はスプ
ールが第１図とは異なる作動位置にある状態を示す第１
図の■−■矢示方向断面図、第３肉は操作杆の操作角と
出力ポートからの出力圧との関係を示す線図、第４図は
スプールのストロークと開口面積との関係を示す線図、
第５図は他の従来技術を示す第２図と同様の断面図、第
６図ないし第８図は本考案の一実施例を示すもので、第
６図は減圧弁型パイロット弁の縦断面図、第７図は第６
図の■−■矢示方向断面図、第８図はス　　　　゛プー
ルのストロークと開口面積との関係を示す線図である。１・・・ハウジング、３・・・高圧側流路、５・・・低
圧側流路、７Ａ、　　７Ｂ・・・出力ポート、４１Ａ、
４１Ｂ・・・スリーブ、４２Ａ、４２Ｂ・・・スプール
、４３Ａ。４３Ｂ・・・小径部、４４Ａ、４４Ｂ、４５Ａ、４５Ｂ
・・・大径部、４７Ａ、４７Ｂ・・・液室、４８Ａ、４
８Ｂ・・・連通路、４９Ａ、　４９Ｂ・・・はみ出し通
路、５０Ａ、５０Ｂ・・・切換流路。８Ａ　　ｆ３８１＝１第４図テ１／第５図（９ＬｊＪ　　　（ＤＢ）Figures 1 to 5 show the prior art, in which Figure 1 is a longitudinal sectional view of a pressure reducing pilot valve, and Figure 2 shows the spool in a different operating position from that in Figure 1. 1st
A cross-sectional view in the direction of the ■-■ arrow in the figure, the third mark is a line diagram showing the relationship between the operating angle of the operating rod and the output pressure from the output port, and the fourth figure shows the relationship between the stroke of the spool and the opening area. line diagram,
Fig. 5 is a sectional view similar to Fig. 2 showing another prior art, Figs. 6 to 8 show an embodiment of the present invention, and Fig. 6 is a longitudinal section of a pressure reducing type pilot valve. Figure 7 is the 6th
FIG. 8 is a cross-sectional view in the direction of the arrows ■-■ in the figure, and is a diagram showing the relationship between the stroke of the spool and the opening area. DESCRIPTION OF SYMBOLS 1... Housing, 3... High pressure side flow path, 5... Low pressure side flow path, 7A, 7B... Output port, 41A,
41B...Sleeve, 42A, 42B...Spool, 43A. 43B...Small diameter part, 44A, 44B, 45A, 45B
...Large diameter part, 47A, 47B...Liquid chamber, 48A, 4
8B...Communication path, 49A, 49B...Protrusion path, 50A, 50B...Switching flow path. 8A f381=1 Fig. 4 Te1/ Fig. 5 (9LjJ (DB)

Claims

[Scope of utility model registration request]

A sleeve is provided inside the housing in which a high pressure side flow path, a low pressure side flow path and an output port are bored, and a spool consisting of a small diameter portion and large diameter portions formed on both sides of the small diameter portion slides inside the sleeve. A switching flow path is provided in the small diameter portion of the spool for switching the output port between the low pressure side flow path and the high pressure side flow path, and one large diameter portion of the spool is provided in the sleeve. A liquid chamber into which the small diameter portion fits when the spool is displaced is provided, and a communicating path is provided that communicates the liquid chamber with the high pressure side flow path, and the small diameter portion of the spool is connected to the liquid chamber in the communicating path. A pressure reducing valve type pilot valve is formed by forming a protruding passage protruding from the liquid chamber so as to communicate the switching passage with the high pressure side passage before fitting into the chamber.