JPS5922369U

JPS5922369U - Unload valve

Info

Publication number: JPS5922369U
Application number: JP11864782U
Authority: JP
Inventors: 豊小島
Original assignee: 株式会社ボッシュオートモーティブ　システム
Priority date: 1982-08-04
Filing date: 1982-08-04
Publication date: 1984-02-10

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 the drawing]

第１図は従来公知のアンロード弁の縦断面図、第２図は
本考案のアンロード弁の実施例を示す縦断面図である。１．２０・・・本体、２・・・油圧ポンプ、３・・・ア
クチュエータ、４・・・アキュムレータ、５・・・油タ
ンク、７．２２・・・チェック弁、９・・・リリーフ弁
、１０・・・パイロット弁、２３・・・スプール孔、２
７・・・第１ポート、３０・・・スプール、３０ａ・・
・ピストン面、３１・・・パイロット圧室、３２・・・
ボール、３４・・・第２ポート、３７・・・第１スプリ
ング、４０・・・第２スプリング、Ｐ・・・パイロット
部、Ｐｌ・・・−火工接続口、Ｐ２・・・二次圧接続口
、ＰＡ・・・アキュムレータ接続口、Ｐｌ・・・タンク
接続口。FIG. 1 is a longitudinal sectional view of a conventionally known unloading valve, and FIG. 2 is a longitudinal sectional view showing an embodiment of the unloading valve of the present invention. 1.20... Main body, 2... Hydraulic pump, 3... Actuator, 4... Accumulator, 5... Oil tank, 7.22... Check valve, 9... Relief valve, 10...Pilot valve, 23...Spool hole, 2
7... 1st port, 30... Spool, 30a...
・Piston surface, 31...Pilot pressure chamber, 32...
Ball, 34...Second port, 37...First spring, 40...Second spring, P...Pilot part, Pl...-pyrotechnic connection port, P2...Secondary pressure Connection port, PA...accumulator connection port, Pl...tank connection port.

Claims

[Scope of utility model registration request]

The main body has a primary pressure connection port connected to the hydraulic pump, a secondary pressure connection port connected to the actuator, an accumulator connection port connected to the accumulator on the secondary pressure side, and a tank connection port connected to the oil tank. - In an unloading valve having a check valve that opens to the secondary pressure side between the valve side and the secondary pressure side, a pilot royal chamber is formed in the main body and the secondary pressure is introduced into the pilot pressure chamber. a first port;
The second port, which has a slightly larger area than the first port and which releases the pressure of the pilot pressure chamber to the oil tank side, faces the second port, and is pressed by the first spring between the first port and the second port. Close the first port, receive secondary pressure from the first pouch, open the first port, insert a pole that closes the second port almost at the same time, and insert the pilot pressure chamber into the spool hole of the main body. An unload valve that communicates with a piston surface at one end of the spool, and the other end of the spool is pressed by a second spring in a direction to cut off communication between the primary pressure connection port of the main body and the tank connection port. .